ARNT and breast cancer: DNA sequences located in the 5′‐flanking region of ODC1 gene and in the third intron of SRM gene (Figure 3J) were enriched by chromatin immunoprecipitation (ChIP) with antibody against HIF‐1α or HIF‐1β, when breast cancer cells were treated with paclitaxel for 3 days (Figure 3K; Figure S3C, Supporting Information), showing that ODC1 and SRM are direct HIF‐1 target genes.